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The crystal structures of the isotypic monoclinic fluorides Na 2 CuF 4  (a = 326.7(1), b = 937.0(2), c = 561.2(1) pm, β = 92.49(1)°; V = 171.63 x10- 30  m 3 ) and Na 2 CrF 4  (a = 334.8(1), b = 954.9(2), c = 566.5(3) pm, β = 92.85(3)°; V = 180.89 × 10 -30  m 3 ) have been redetermined by single crystal X-ray methods. The compounds are Jahn-Teller distorted variants of the orthorhombic Sr 2 PbO 4 type (space group Pbam) and crystallize with Z = 2 in space group P2 1 /c, a subgroup of Pbam. They form a chain structure of edge-sharing octahedra which are strongly elongated. The following distances were obtained: Cu-F = 190.4/193.8/235,7(2) pm and Cr-F = 199.1/199.7/241.7(4) pm. The geometry is compared to that of the corresponding distorted rutile type difluorides; relations to further compounds are discussed.

zeitschrift für naturforschung b

Die Jahn-Teller-Verzerrung in den Kristallstrukturen der Dinatrium-Tetrafluorometallate Na 2 CuF 4  und Na 2 CrF 4  / The Jahn-Teller Distortion in the Crystal Structures of the Disodium-Tetrafluorometallates Na 2 CuF 4  and Na 2 CrF 4